Due, sounds like you have the fresh water issue more than adequately addressed.
Of course, you've already considered a completely mechanical pump for your well - of the type that windmills and oil wells use. A very small pump jack like what is used on oil wells, would be an 'interesting' addition - and quite functional. Those pumps are pretty durn good. Used to sell 'pump leathers' for windmill pumps way back when (high school - working at Big Spring Hardware). Have only been involved once in my life in 'pulling' the tubing from a water well. Think it was around 20 joints or so (so maybe close to the same depth as yours. Involved a portable A-frame - and jerry rigging for 'holding' the pipe in place (to prevent dropping) each time we lifted and unscrewed a joint. Was a real blast to do it.
On drilling rigs - several 'trips' a day are sometimes done when shallow - can take 8-12 hours to 'trip' the well when the depths get to 10k+. And yes - sometimes the drill string gets dropped - and life suddenly gets very interesting (and expensive). Fishing the hard way. *s*
A pump jack can be electric powered, gas powered, or 'human powered' - say via chain and sprocket assemblies.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...
| 
